Transaction in Own Shares

National Grid PLC
11 October 2007


National Grid plc - Transaction in Own Shares

11 October 2007


National Grid plc announces that on 10 October 2007 it purchased for
cancellation 750,748 of its ordinary shares at a price of 765.4380 pence per
share from Morgan Stanley Securities Limited.

Following the purchase and upon cancellation of these shares, the number of
ordinary shares with voting rights in issue (excluding Treasury shares) will be
2,591,794,721 and the number of ordinary shares in Treasury will be 13,171,056.



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